Adding range checking for user input

#include

using namespace std;

int main()

{

cout << "Temperature Conversion Program." << endl;

cout << "Enter degrees Celsius from 0 to 100: " << flush;

double degreesCelsius;

cin >> degreesCelsius;

if((degreesCelsius < 0) || (degreesCelsius > 100)){

cout << "The number you entered is invalid." << endl;

}else{

double degreesFahrenheit = degreesCelsius*(9.0/5.0)+32;

cout << degreesCelsius << " degrees Celsius = ";

cout << degreesFahrenheit << " degrees Fahrenheit" << endl;

}

}